SOURCE

const url = "https://alibaba.com?a=1&b=2&c=3#/abc/def?a=2&b=3&c=4"
function getParamFromURL(url, key) {
   //...your code
    const execStr = new RegExp(`/\?${key}=(.+)\#/`)
    const result = execStr.exec(url)
    console.log(result[1][0])
 }
getParamFromURL(url, 'c')